Deep-UV generation in an SBO crystal with an irregular domain structure

Random (stochastic) quasi-phase matching is demonstrated for broadband radiation in a one-dimensional irregular strontium tetraborate nonlinear photonic crystal. Harmonic generation tunable in the range 187.5 — 215 nm is achieved. The average power of the generated signal is a quadratic function of pump power and reaches 1 mW. In a steady-state model, taking into account sum frequency generation within the spectrum of the input light causes no broadening of the peaks in the spectrum of the generated signal.